[unity] Fixed Spine URP shaders package using non UPM include paths in common shaders. Closes #2050.

spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Include/SpineCoreShaders/ShaderShared.cginc

@@ -1,3 +1,3 @@
 // Adapt this path accordingly if you have unpacked the Spine directory to another location.
-#include "Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/ShaderShared.cginc"
-//#include "Packages/com.esotericsoftware.spine.spine-unity/Runtime/spine-unity/Shaders/Sprite/CGIncludes/ShaderShared.cginc"
+//#include "Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/ShaderShared.cginc"
+#include "Packages/com.esotericsoftware.spine.spine-unity/Runtime/spine-unity/Shaders/Sprite/CGIncludes/ShaderShared.cginc"

spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Include/SpineCoreShaders/Spine-Common.cginc

@@ -1,3 +1,3 @@
 // Adapt this path accordingly if you have unpacked the Spine directory to another location.
-#include "Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Common.cginc"
-//#include "Packages/com.esotericsoftware.spine.spine-unity/Runtime/spine-unity/Shaders/CGIncludes/Spine-Common.cginc"
+//#include "Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Common.cginc"
+#include "Packages/com.esotericsoftware.spine.spine-unity/Runtime/spine-unity/Shaders/CGIncludes/Spine-Common.cginc"

spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Include/SpineCoreShaders/Spine-Outline-Common.cginc

@@ -1,3 +1,3 @@
 // Adapt this path accordingly if you have unpacked the Spine directory to another location.
-#include "Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Outline-Common.cginc"
-//#include "Packages/com.esotericsoftware.spine.spine-unity/Runtime/spine-unity/Shaders/CGIncludes/Spine-Outline-Common.cginc"
+//#include "Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Outline-Common.cginc"
+#include "Packages/com.esotericsoftware.spine.spine-unity/Runtime/spine-unity/Shaders/CGIncludes/Spine-Outline-Common.cginc"

spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/Include/SpineCoreShaders/SpriteLighting.cginc

@@ -1,3 +1,3 @@
 // Adapt this path accordingly if you have unpacked the Spine directory to another location.
-#include "Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/SpriteLighting.cginc"
-//#include "Packages/com.esotericsoftware.spine.spine-unity/Runtime/spine-unity/Shaders/Sprite/CGIncludes/SpriteLighting.cginc"
+//#include "Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/SpriteLighting.cginc"
+#include "Packages/com.esotericsoftware.spine.spine-unity/Runtime/spine-unity/Shaders/Sprite/CGIncludes/SpriteLighting.cginc"